JPH08227280A - Light emission type display circuit or device and image display device with it - Google Patents

Abstract

PURPOSE: To reduce visual influence of an LED device being useless information for a main video source by sensing peripheral illuminance and controlling the light emission luminance of the LED device based on the illuminance data obtained there. CONSTITUTION: A signal outputted from a controller 3 so as to drive a light emission type display device 1 is inputted to a drive part 6. On the other hand, an illuminance sensing part 4 senses peripheral brightness, and an illuminance data conversion part 5 converts the brightness to an electric signal based on the illuminance data, and the electric signal is inputted to the drive part 6. The drive part 6 outputs an optionally set drive current or drive voltage based on the illuminance data inputted from the conversion part 5 by making the signal inputted from the device 3 a trigger to drive the display device 1. Since the light emission luminance of the device 1 is varied by the current or the voltage outputted the drive part 6, the light emission luminance is suppressed according to the peripheral illuminance. Thus, the difference (difference sensing visually) of the light emission luminance sensing according to the difference of the illuminance is relaxed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting display device, and more particularly to a light emitting display device built in or attached to a video display device.

[0002]

2. Description of the Related Art A conventional example of a television receiver is a light emitting display device (hereinafter referred to as an LED device).
Often displays the state of the television receiver at that time, for example, "display of" power on "state",
"Display of standby status by remote controller", "Display of on-timer setting", "Display of stereo broadcast mode"
And the like. Generally, a display method is to detect a control signal from a microcomputer or the like and drive an LED device to display light. As for the display form, if the lamp is a power on / off lamp, it is generally always in a light emitting state when the power is on, and the on timer display lamp is also in a light emitting state by setting a timer. In addition, if it is a stereo broadcast mode display lamp, it is illuminated and displayed each time it is switched to stereo broadcast.

This is a special issue of TV Technology October issue (1
October 20, 1988 Electronic Technology Publishing Co., Ltd.) 3
It can be read from the circuit diagram on page 96.

[0004]

However, the LED device which constantly emits light or repeats light emission every time the stereo broadcast is switched as described above is unnecessary for the image contents to be viewed. It is information, and may feel visually pleasing. Furthermore, since the brightness of this LED device is always constant, even if the surroundings are bright, it does not matter so much, but when the surroundings are dark, it is noticeable. In particular, the more the camera is used as a home theater such as a projection monitor, the more the light emission of the LED is concerned.

An object of the present invention is to reduce L due to the difference in ambient illuminance.
Focusing on the difference in how the ED device senses the light emission brightness, it is to reduce the visual influence of the LED device, which is unnecessary information on the main video source.

[0006]

In order to solve the above problems, the present invention senses the illuminance of the surroundings and controls the emission brightness of the LED device based on the illuminance data obtained there.

[0007]

According to the present invention, since the light emission brightness of the LED device can be changed by the illuminance of the surroundings, for example, if the light emission brightness is set high when the surroundings are bright and set low when the surroundings are dark, the light is emitted when the surroundings are dark. Brightness is suppressed,
Feeling of the main image is reduced. Also,
Since the setting of the light emission brightness can be made arbitrarily, it is difficult to feel the difference in the light emission brightness of the LED device which is visually perceived due to the difference in the illuminance, so that there is no discomfort.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some of the embodiments of the invention described above will be described with reference to the drawings.

FIG. 1 is a circuit block diagram in which a user can manually set the light emission brightness of the light emitting display device. In FIG. 1, 1 is a light emitting display device, 2 is a variable resistor, and 3 is a control device for controlling the driving of the light emitting display device.

A signal output from the control device 3 so as to drive the light emitting display device 1 is input to the variable resistor 2.
The other end of the variable resistor 2 is connected to the light emitting display device 1.

The variable resistor 2 can be arbitrarily set by the user, and by changing the resistance of the variable resistor 2, the emission brightness of the light-emitting display device 1 can be controlled, and the brightness can be adjusted to a user's preference. Is.

FIG. 2 is an example of an automated version of the variable resistor 2. Reference numeral 4 denotes a peripheral illuminance detecting section, 5 denotes an illuminance data converting section for converting the illuminance data obtained by the peripheral illuminance detecting section 4 into an electric signal, and 6 denotes a driving section for driving the light emitting display device 1.

A signal output from the control device 3 so as to drive the light emitting display device 1 is input to the drive unit 6. On the other hand, the illuminance sensing unit 4 senses the surrounding brightness (illuminance),
Based on the illuminance data, the illuminance data converter 5 converts the illuminance data into an electric signal, which is input to the drive unit 6. The drive unit 6 uses the signal input from the control device 3 as a trigger to output a drive current or a drive voltage that is arbitrarily set based on the illuminance data input from the illuminance data conversion unit 5, and thus the light emitting display device. Drive 1 Since the light emission brightness of the light emitting display device 1 can be changed by the current or the voltage output from the drive unit 6, it is possible to suppress the light emission brightness depending on the ambient illuminance.

As a method of changing the brightness depending on the ambient illuminance, the dimmer device disclosed in Japanese Patent Laid-Open No. 153519/1993 is well known. The dimmer device controls the contrast and brightness according to the ambient illuminance and automatically adjusts the video signal. The present invention provides a control signal output from a dimmer circuit of an image display device having a dimmer device,
It is also possible to connect it to the input of the drive unit 6 to provide an image display device that controls the emission brightness of the light-emitting display device 1 in conjunction with the control of contrast, brightness and the like.

[0015]

Since the light emission brightness of the light emitting display device can be changed according to the ambient illuminance, the difference in the light emission brightness (visually perceived difference) caused by the difference in the illuminance can be reduced.
For example, when viewing an image with dark surroundings (such as when viewing movie software as if it were a movie theater), the emission brightness of the LED device is lowered to a level that is arbitrarily set according to the surrounding illuminance. The impact on the source can be mitigated.

[Brief description of drawings]

FIG. 1 is a block diagram of a first circuit for explaining an embodiment of the present invention.

FIG. 2 is a block diagram of a second circuit illustrating an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Light emitting type display device, 2 ... Variable resistor, 3 ... Control device which controls drive of a light emitting type display device, 4 ... Illuminance detection part, 5 ...
Illuminance data converter 6, drive unit for driving the light emitting display device.

Claims (9)

[Claims] 1. A light emitting display device having an electric light emitting display function, wherein the light emission brightness of a light emitting display portion can be varied in a plurality of steps depending on the degree of ambient illuminance. 2. A light emitting display circuit having an electric light emitting display function, wherein the light emission brightness of the light emitting display portion can be changed in a plurality of steps depending on the degree of ambient illuminance. 3. The light-emitting display device according to claim 1, which has one or a plurality of light-emitting display portions for one control system, and is connected in series or in parallel, or both of them are connected. 4. The image display device according to claim 1, wherein the light emitting display device and a circuit are incorporated. 5. An illuminance sensing portion for sensing ambient illuminance, an illuminance data converting portion for converting data of the illuminance sensing portion into an electric signal, and a light emitting display device having an electric light emitting display function. In the image display device, based on the illuminance data captured by the illuminance sensing portion, the illuminance data conversion portion converts the illuminance data into an electrical signal, and the electrical signal controls the emission brightness of the light emitting display device. Characteristic image display device. 6. The image display device according to claim 5, wherein a single or a plurality of light emitting display devices can be controlled. 7. A light-emitting display device having an electric light-emitting display function, wherein the light-emission brightness of the light-emitting display portion can be changed in a plurality of steps regardless of whether it is manual or automatic. 8. A light-emitting display circuit having an electric light-emitting display function, wherein the light-emission luminance of the light-emitting display portion can be changed in a plurality of steps, whether manually or automatically. 9. The image display device according to claim 7, wherein the light emitting display device or the light emitting display circuit is provided.